Mechanism of anomalous type electrodeposition of Fe-Ni alloys from sulfate solutions

Hiroaki Nakano, Masayuki Matsuno, Satoshi Oue, Masaaki Yano, Shigeo Kobayashi, Hisaaki Fukushima

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

The electrodeposition of Fe-Ni alloys was performed galvanostatically in the sulfate solutions of pH 1-3 at 40°C and the alloy deposition behavior was compared with that of Zn-iron-group metal alloys to investigate their codeposition mechanism. The deposition behavior of Fe-Ni alloy showed a typical feature of the anomalous codeposition, in which electrochemically less noble Fe deposits preferentially under most plating conditions. The anomalous codeposition behavior in Fe-Ni alloy deposition was evidently dependent on the pH buffer capacity of the solutions. This can be explained in terms of the preferential adsorption of FeOH on the deposition sites of more noble Ni due to the extremely smaller dissociation constant of FeOH+ than NiOH - in the multi-step reduction process of hydrated iron-group metal ions.

Original languageEnglish
Pages (from-to)3130-3135
Number of pages6
JournalMaterials Transactions
Volume45
Issue number11
DOIs
Publication statusPublished - Nov 2004

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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